Drill and hole cleaner



Jan. 17, 1933. s. E. MORTIMER DRILL AND HOLE CLEANER Filed 00L 4, 1929 2 Sheets-Sheet l IIIIIIII SAMUEL L. Mm TIMER.

attomwq Jan. 17, 1933.

S. E. MORTIMER DRILL AND HOLE CLEANER Filed Oct. 4, 1929 2 Sheets-Sheet dtkomq Patented Jan. 17, 1933 UNITED STATES mm we SAMUEL ,E. MORTIMER, or LORAIN, OHIO, VASSIGNOR or ONE-FOURTH 'ro- WILLIAM v. GLAMPET, 0F DAYTON, OHIO, ONE-FOURTH T0 CARL E. .HENNIES, oFoLEvELAND, OHIO, AND ONE-FOURTH r0 JOSEPH I. GLIDDEn,-. oF LAK WOOD, OHIO DRILL AND I-IOLE- CLEAN R v Application filed October 4 1929. Serial No. 397,244.

My invention'relates to an improved drill and hole cleaner, and has for its princlpal object a useful embodiment in manually op-. .erated drill for drillingrock, concrete and other mineral or hard material and which cleans the hole as it drills it. It is further improved overthe prior patented art in that the entire device comprises telescoping parts having a common axis with the drill stem, ineluding an outer barrel by which the tool may be held in one hand of the operator, and the drill stem and an upper reciprocating plunger are mounted in alinement within the outer barrel or cylinder. The axi'ally-alined parts are normally spaced apart by a compression spring which contacts directly an enlargement on the plunger and a detachable plug or closure at the bottom ofthe cylinder, while an inner end of the drill stem is positioned within the said spring coil but in no wise attached thereto.

It is a further object of myfinvention that the drill stem has a longitudinal, axial opening throughout its length, but for other rea- "sons to be explained in this description, will need no valve for this opening, but will permit reciprocation of the into the opening.

It is a special advantage to support the said plunger to force air compression spring upon a directly attached portion of the cylinder and thereby serve to raise the said plunger to receive a fresh blow thereon delivered manually by the operator.

Only the one spring is used or needed in my improved device. a

In certain cases, I may use a sectional stem asa modified form shownin Figs. 10, 11, 13 and 14. Such construction has the advantage of permitting a change of the lower drill section without removal of the upper section.

Further details will be explained later in the specification. Other features of my invention will be explained by reference to the accompanying preferred embodiment 7 v z a flanged split collar f suitable metal havtaken through my device, certain portions being broken away, and other partssliown in elevation;

device for use withthe drill stem of Fig. 11;

stem with the sections separated.

Figure '2' is a transverse sectiongshown in the plane indicated by the line; 22 of Fig. v1; Figure 3'is a transverse-section shown in the plane indicated by the line" 3', 3 of ig.1;-' '1 "if Figure 4.- is a transverse section taken in %1e plane indicated by the line 44 I of I Figure 5 is an end view of the drill stem;

Figure his a perspectivefof'a spring band devilge' for detachable application to the stoc I Figure 7 is an elevation 'of the'lower end" ofthe stem andfbarrel attachment,withcertain parts broken away to reveal the interior,- and the angle of vision being 'at right angles to'that'shown in Fig.1; v Figure 8 is a central,ver'tical section of a" portion of the plungerand its'enlargement, through one-of the valv S; T

Figure'9 is a transverse section taken on the plane indicated by the line 9'9'of Fig. 8

"Figure 10.is a side elevation of my improve ment embodyinga modified form of" drill-' stem, parts being broken away;

F'gure ll'is a side elevation of the drill element shown in Fig. 10, butturned 90;on' its 1 vertical axis; F I i Figure'12 is an elevation of a separating,

Figure 13 is a transversesection of theste'm 7 shown in the plane indicated by the line F'gure 1 4 is a perspective viewof the drill "My drilling tool as a complete'd'evice, comprises anelongated cylinder-T5 which'readily serves as atool stock whereby the tool may be held in properjposition over the point to Which'the drill is to be applied, by one hand of the operator, while force'is delivered to the plunger above. This cylinder is usually constructed of case-hardened nickel,.steel or other suitable materiaL- The upper end of this barrel is internally threaded to receive ing reduced'external threads 7 fitting the inner threads of the cylinder end. v The lower. end of the cylinder 5 is also internally threadedat J8 toreceive therein a flanged split collar 9 which is centrally apertured at 10, and whose threaded portion 11 may engage the threads 8. One of the halves 12 of the collar 9 is radially apertured at 13' which latter is threaded at 14 to receive the threaded set screw 15 Which engages. the

alined apertures in the collar and cylinder wall, as disclosed in Figs. 1 and 4. The en-' larged polygonal head 16' of. the screw 15 serves-toactuate-thescrew.

Externally ofthe lower end of the cylinder 5, a flexible band loop 17 is detachably mounted thereabout, parallel outwardly-bent tips 18 being cut out at a central point of said loop 17 as at 19, whereby the tips 18 may be;usedto. adj nst thesaid screw 15 longitudina lly in the apertures, and. may also serve to holdthe screw inposition-to loclrthecollar 92in position-in the cylinder wall, as well as for other functions to be explained later. Theloop- L'Z will; be heldagainst descending unduly, by. its engagementofthe flanges 20 of the collar 9. The collar 6 will be provided with a large aperture 2 1 for receiving an axialplunger 22; to [be later described.

'Iihe said plunger is provided: with. a cylindrical enlargement 28 which fits neatly within thecylinder 5 but preventszrising higher than theicollar. 6-and serves asashoulder to limit the rise a of the plunger 22; Within the cylindent and-.below'the said enlargement, is

mounted a coil spring-5'24 whoseupper end pressesagainst the-enlargement23 to hold the plunger. normally to its upper limit, whilethe lower end of the spring rests directly uponrthe A collar 92 Fitted withinlthewaxial aperture of the collar-19; isa drillstem25having acentral? aperture- 26 extending its entire length, the

maimpart ofthe' stem-being of substantially. uniform radius,-,but the upper end of'the-stem hayingtwolongitudinally spaced heads or enlargements .llhG' lOWBIi" one 27 being; outside of and fitting upwardly against the lower endof\ th e,;collar. 9,.andg the upper. enlargement 28 positionedwithin the cylinder andhaving a r-adiussomewhatlesslthan-that. ofthe inner chamber of-the cylinder 5u- The head 28 has an extreme upper (position normally suchas-shownin Fig. .1 within the cylinder 5' and'above thegcollar 9;.and'the space betweenthis head and the lower collar 9 may receivegsnuglyi therein a1flex-ible tubular band-29 which will yield slightly to longitudinal movement ofthe stem and its headwithin the cylinder. The lower 'endofthe spring245 surrounds. thischead 28.

The. reduced portion 30 of the stem-between the enlargements 27. and 28' is 'fittedl within the. aperturelO ofitheicollar 9 whiclrbeing split,- isdetachably' mounted upon the portion 30aand may-.bers'ecured to thelower end of the-cylinder 5 by-the threaded engagement 8. Very little-,movement oftthe member 30* in. the: collarris required; sincethe. stem 25' issintegral' with the enlargements, and a blow I perceptible.

The set screw 15' has a reduced inner end 32' with which thestem portion 30mayhave relative-movement correspond-ingto'that prd vided for by the band 29 by the provision of a slightly elongated external slot v33 in the part 30; The cylinder or barrel 5 has formed therein somewhat beneath the leather washer V 34, one or more radial air inlet holes 35, and the cylindrical enlargement 28, has provided a plurality of longitudinal apertures there-:

through quite closely adj aeent the periphery thereof; Each ,ofthese apertures through the head: 23 includes a very small" opening 36 leading downwardly'into a larger chamber 37 carrying therein a ball 38,-thereby providing a plurality of very delicatevalves'in the enlargement 23which-by momentum and by.

the reciprocation-of the plunger22willop; erate bythe upward movement of the ball to close the opening. 36.and dropping downward 1n, said chamber agalnst retainingp n-39;

to openthe valve.

The reciprocation oli the plunger 22 will operatethe'valv es in the enlargement 23-by" the momentum oftheballs 38.] The sudden descent of the plunger causes the ballsf38 to rise relatively in, the chambers and. close the openings 36,.so that. the airinthe cylinder 5 is compressed toforce air outward throughthe drill aperture26 to-blowi out ofitdust and dirtthat may accumulate jtheree l in andt-hereby reducing friction; I

great disadvantage has arisen in the past from the use of ball valves:

directly connected with the drillstem to prevent back suction of dirt through "the" axial openingiin the drill stem; Such dithv culty has been obviated more or less insome constructions by providing aball'v'alve practically within such stem opening. and intermediate its ends, butditliculty has arisen from such construction in the actuation 05 the ball inflsuch a valve sinceth'e drill: stem does nottit'self reciprocate, and compression 7 spring has been found. essential to normally close the-valve. A'furth-er disadvantage in such-a construction lies in the meansjnecessary for opening-thefstem for cleaning. out andi repairing the valve held withinacentral chamber ofthe drill. This I have oyercome by providing the ball valve in the reciprocat- I ing plunger rather than in the drill stem, my improved valve requiring no additional means other than momentum for actuating the ball which readily drops down upon the pin 39xwhenrthe plunger rises -jby the force of I the spring 24, and is eiiective in prevent ng;

the back suction of prior structures by opening the apertures 36. v

l/Vhile the valve apertures 36 are small, a plurality of the valves may be used, three being. shown in Fig. 9, and more may beused if desired. This construction isespecially advantageous in that it affords ready opening of the parts for cleaning the. valves by merely removing the collar 6 and lifting out the plunger. This is a decided advantage, aside from the great reduction in the expense of manufacturing the stem part as an integral unit. The manufacture of the valve openings in the enlargement 23-is relatively in expensive.

Iii-Figs. 10 to '14 I have shown a sectional drill stem 40 whose upper section 41 is provided with a frusto-conical'socket to receive a correspondingly shaped male portion 42 of the lower section of the stem which normally fits neatly within such socket, but permits the use of a plurality of lower sections.

The sections of the stem 40 will be provided with the axial opening 26 of the other form, and indeed, the structure of the entire upper portion of the section 41 will be like that shown in Fig. 1. A very narrow ledge or shoulder 43 on the lower section 44 will receive a portion of the impact of the plunger stroke, though the said socket 45 is fitted so closely upon the cone 42 that the sections will be held together without the provision of any othermeans. Additional means have however been provided for assisting the removal of the lower section 44 when a substitution of other sections thereforis desired. Such means, it has been'found, may consist of a slight tilting of the wedge member 46 designed to enter a space formed between the drill sections by cutting out a vertical face 47 on the cone 42 adjacent the shoulder 43 and cutting oil an edge 48 of the section 41 to bear the force of the wedge 46 as the latter rests upon the shoulder 43. The insertion of the wedge or a wedge serves to separate drill sections.

It is evident that my improved drill may be operated by the hand, compressed air, steam or electricity for drilling in very hard or semi-hard material.

Having set forth the principles of my in-" vention, and described and illustrated an embodiment thereof for practical use, what I claim and desire to secure by Letters Patent,

1. A combined hole drilling and cleaning device comprising an open ended cylinder, a

-plunger having longitudinal reciprocating movement in said cylinder and through its upper end and provided with an enlargement within the cylinder for limiting its upward movement, a drill point movable axially in the lower opening of the cylinder and having an unobstructed axial opening therethrough, an enlargement on the upper end of said drill point movable axially withinthe cylinder for preventing disengagement of the cylinder anddrill pointpball valves carried by said plunger enlargement 'ito'prevent back= suction through said axial open ing when the plunger movesupwardly but closing as the plunger descends, and a coil spring within the cylinderfnormally holda mg the. P g a o efind separate, f th drill member. I r g 2. A combined holerdrilling andcleaning device comprising an open ended'cylinder, a collar having an axial'opening detachably securedin each end of thecylinder, a plunger having longitudinal movement inlsaidcylinn der and through itsuppercollar, a cylindrical enlargement [on said plunger within 7 the cylinder, a drill point, extending, through the lower collar of the cylinder and having,

an unobstructed axial opening therethrough,

an enlargement on the upper end of. said.

drill point positioned within the cylinder above the lower collar for-preventing, dis;

engagement of the cylinder and drill point, ball valves carried by said plunger enlargement to prevent back suction: through said axial opening ofthe drill point, the said valves closing and opening automatically as the plunger descends and rises, respectively, and a coil spring surrounding the plunger to position.

normally hold the latter in its uppermost 3. A percussion drill comprising an open resting upon a fixed portion of the'cylinderandnormally holding the plunger above the upper end of said stem.

4.A percussion drill comprising an open ended cylinder,- a plunger longitudinally movable through the upper end of the cylinder, a cylindrical enlargement on said plunger within the cylinder for limiting the upward movement of the plunger, a drill point in the lower opening of the cylinder and having an unobstructed axial opening therethrough, an enlargement on the upper end of said drill point within said cylinder for preventing disengagement of the same from the cylinder, gravity ball valves carried'by said plunger enlargement to prevent back suction through said axial opening in the drill point when the plunger moves upwardly but closing as the plunger descends,

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